Investment Securities Available for Sale (Details) $ in Thousands	Mar. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 311,038	$ 301,876	$ 347,701
Available-for-Sale	305,589	300,200	347,159
Gross Unrealized Gains	354	935	1,519
Gross Unrealized Losses	5,803	2,611	2,061
Available-For-Sale Securities, Pledged as Collateral	229,857	183,052	295,797
Maturities of Debt Securities, at Amortized Cost:
Within One Year	22,272
From 1 - 5 Years	169,873
From 5 - 10 Years	71,681
Over 10 Years	47,212
Maturities of Debt Securities, at Fair Value:
Within One Year	22,205
From 1 - 5 Years	166,012
From 5 - 10 Years	70,348
Over 10 Years	47,024
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	136,627	99,776	174,194
12 Months or Longer	124,088	121,105	800
Total	$ 260,715	$ 220,881	$ 174,994
Number of Securities in a Continuous Loss Position	113	106	61
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 2,212	$ 546	$ 1,861
12 Months or Longer	3,591	2,065	200
Total	5,803	2,611	2,061
U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	60,264	60,328	147,012
Available-for-Sale	59,657	59,894	147,231
Gross Unrealized Gains	0	0	270
Gross Unrealized Losses	607	434	52
Maturities of Debt Securities, at Amortized Cost:
Within One Year	13,018
From 1 - 5 Years	47,246
From 5 - 10 Years	0
Over 10 Years	0
Maturities of Debt Securities, at Fair Value:
Within One Year	12,949
From 1 - 5 Years	46,708
From 5 - 10 Years	0
Over 10 Years	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	17,128	20,348	42,937
12 Months or Longer	42,529	39,546	0
Total	$ 59,657	$ 59,894	$ 42,937
Number of Securities in a Continuous Loss Position	14	14	11
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 266	$ 172	$ 52
12 Months or Longer	341	262	0
Total	607	434	52
State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	9,741	10,351	25,467
Available-for-Sale	9,743	10,349	25,507
Gross Unrealized Gains	7	9	40
Gross Unrealized Losses	5	11	0
Maturities of Debt Securities, at Amortized Cost:
Within One Year	8,363
From 1 - 5 Years	650
From 5 - 10 Years	208
Over 10 Years	520
Maturities of Debt Securities, at Fair Value:
Within One Year	8,360
From 1 - 5 Years	655
From 5 - 10 Years	208
Over 10 Years	520
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	7,421	8,498	828
12 Months or Longer	0	0	0
Total	$ 7,421	$ 8,498	$ 828
Number of Securities in a Continuous Loss Position	29	36	5
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 6	$ 11	$ 0
12 Months or Longer	0	0	0
Total	6	11	0
Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	240,033	229,077	170,601
Available-for-Sale	235,389	227,596	169,728
Gross Unrealized Gains	347	485	934
Gross Unrealized Losses	4,991	1,966	1,806
Maturities of Debt Securities, at Amortized Cost:
Within One Year	891
From 1 - 5 Years	121,977
From 5 - 10 Years	71,473
Over 10 Years	45,692
Maturities of Debt Securities, at Fair Value:
Within One Year	896
From 1 - 5 Years	118,649
From 5 - 10 Years	70,140
Over 10 Years	45,704
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	112,078	70,930	127,931
12 Months or Longer	80,759	80,759	0
Total	$ 192,837	$ 151,689	$ 127,931
Number of Securities in a Continuous Loss Position	69	55	41
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 1,940	$ 363	$ 1,806
12 Months or Longer	3,050	1,603	0
Total	4,990	1,966	1,806
Corporate and Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	1,000	1,000	3,501
Available-for-Sale	800	800	3,298
Gross Unrealized Gains	0	0	0
Gross Unrealized Losses	200	200	203
Maturities of Debt Securities, at Amortized Cost:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	1,000
Maturities of Debt Securities, at Fair Value:
Within One Year	0
From 1 - 5 Years	0
From 5 - 10 Years	0
Over 10 Years	800
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	2,498
12 Months or Longer	800	800	800
Total	$ 800	$ 800	$ 3,298
Number of Securities in a Continuous Loss Position	1	1	4
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 3
12 Months or Longer	200	200	200
Total	200	200	203
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost		1,120	1,120
Available-for-Sale		1,561	1,395
Gross Unrealized Gains		441	275
Gross Unrealized Losses	0	0	0
Securities in a Continuous Loss Position, at Fair Value:
Less than 12 Months	0	0	0
12 Months or Longer	0	0	0
Total	$ 0	$ 0	$ 0
Number of Securities in a Continuous Loss Position	0	0	0
Unrealized Losses on Securities in a Continuous Loss Position:
Less than 12 Months	$ 0	$ 0	$ 0
12 Months or Longer	0	0	0
Total	0	0	0
Fair Value, Measurements, Recurring
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	305,589	300,200	347,159
Fair Value, Measurements, Recurring | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	59,657	59,894	147,231
Fair Value, Measurements, Recurring | State and Municipal Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	9,743	10,349	25,507
Fair Value, Measurements, Recurring | Corporate and Other Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	800	800	3,298
Fair Value, Measurements, Recurring | Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale		1,561
US Treasury Securities | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	0	0	54,649
Available-for-Sale	0	0	54,695
Agency Securities | U.S. Agency Obligations
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	60,264	60,328	92,363
Available-for-Sale	59,657	59,894	92,536
Agency Securities | Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	59,446	40,832	1,616
Available-for-Sale	59,469	40,832	1,625
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential
Schedule of Available-for-sale Securities [Line Items]
Available-for-Sale	175,920	186,764	168,103
US Government-sponsored Enterprises Debt Securities | Mortgage-Backed Securities - Residential | US Government-sponsored Enterprises Debt Securities
Schedule of Available-for-sale Securities [Line Items]
Available-For-Sale Securities, at Amortized Cost	$ 180,587	$ 188,245	$ 168,985